Łomża Governorate[a] was an administrative-territorial unit (guberniya) of Congress Poland of the Russian Empire, with its capital in Łomża.

In 1867 territories of the Augustów Governorate and the Płock Governorate were divided into a smaller Płock Governorate, Suwałki Governorate (consisting mostly of the Augustów Governorate territories) and a recreated Łomża Governorate.

In 1893, a small amount of territory was transferred from the Łomża Governorate to the Warsaw Governorate.

It was divided into seven counties: